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This article introduces the relevant knowledge of "what is the calculation method of margin for different elements of CSS". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Inline, non-permutation element: if the margin value is auto, the calculated values of margin-left and margin-right are also

Inline, replacement element: ditto

Inline-block, replacement elements in the document stream: ditto

Inline-block, non-permutation elements in the document stream: ditto

'margin-left' +' border-left-width' + 'padding-left' +' width' + 'padding-right' +' border-right-width' + 'margin-right' = width of containing block

In the following case, if the margin value is auto

If width is autovalue, then the other value is auto

If the values of margin-left and margin-right are auto and the values used are equal, they are centered horizontally relative to the containing block.

Block-level replacement elements, in document stream

Same as block-level non-permutation elements.

Summary

For both inline-level permutation elements and non-permutation elements, both margin-left and margin-auto are calculated when the margin value is auto.

Block-level replacement elements and non-substitution elements:

'margin-left' +' border-left-width' + 'padding-left' +' width' + 'padding-right' +' border-right-width' + 'margin-right' = width of containing block

If width is autovalue, then the other value is auto

If the values of margin-left and margin-right are auto and the values used are equal, they are centered horizontally relative to the containing block.

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